Metal atom co-ordination

Hello,

I am trying to do a minimisation with a ligand which co-ordinates to a Zn2+ atom in the active site. This is supposed to be a huge interaction, but when I try to minimise my De Novo ligand, the minimisation sends my co-ordinating moeity far away (a secondary amine from a histidine).

Any help would be significantly appreciated, thank you!!